Article 3. The request for nomination of conciliators under the Article 12 of the Act, the request for mediation under Items 1-3, Paragraph 1, Article 18, or Paragraph 2 of the Act or the request for arbitration under the Article 30 of the Act shall be made in writing with the salient facts of the case by the concerned parties (when they are juridical persons, or the employers' organizations or the labor union who are not juridical persons, or organizations of the parties in dispute, they shall mean their representatives) or their delegates.